add unchecked to optimize gas

1inch · Aug 23, 2021 · 5d19a1a · 5d19a1a
1 parent 96fb63d
commit 5d19a1a
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Showing 3 changed files with 15 additions and 9 deletions.
diff --git a/contracts/CumulativeMerkleDrop.sol b/contracts/CumulativeMerkleDrop.sol
@@ -45,9 +45,11 @@ contract CumulativeMerkleDrop is Ownable, ICumulativeMerkleDrop {
         cumulativeClaimed[account] = cumulativeAmount;
 
         // Send the token
-        uint256 amount = cumulativeAmount - preclaimed;
-        IERC20(token).safeTransfer(account, amount);
-        emit Claimed(account, amount);
+        unchecked {
+            uint256 amount = cumulativeAmount - preclaimed;
+            IERC20(token).safeTransfer(account, amount);
+            emit Claimed(account, amount);
+        }
     }
 
     // function verify(bytes32[] calldata merkleProof, bytes32 root, bytes32 leaf) public pure returns (bool) {

diff --git a/contracts/CumulativeMerkleDrop128.sol b/contracts/CumulativeMerkleDrop128.sol
@@ -44,9 +44,11 @@ contract CumulativeMerkleDrop128 is Ownable, ICumulativeMerkleDrop128 {
         cumulativeClaimed[account] = cumulativeAmount;
 
         // Send the token
-        uint256 amount = cumulativeAmount - preclaimed;
-        IERC20(token).safeTransfer(account, amount);
-        emit Claimed(account, amount);
+        unchecked {
+            uint256 amount = cumulativeAmount - preclaimed;
+            IERC20(token).safeTransfer(account, amount);
+            emit Claimed(account, amount);
+        }
     }
 
     // function verify(bytes calldata proof, bytes16 root, bytes16 leaf) public pure returns (bool) {

diff --git a/contracts/CumulativeMerkleDrop160.sol b/contracts/CumulativeMerkleDrop160.sol
@@ -44,9 +44,11 @@ contract CumulativeMerkleDrop160 is Ownable, ICumulativeMerkleDrop160 {
         cumulativeClaimed[account] = cumulativeAmount;
 
         // Send the token
-        uint256 amount = cumulativeAmount - preclaimed;
-        IERC20(token).safeTransfer(account, amount);
-        emit Claimed(account, amount);
+        unchecked {
+            uint256 amount = cumulativeAmount - preclaimed;
+            IERC20(token).safeTransfer(account, amount);
+            emit Claimed(account, amount);
+        }
     }
 
     // function verify(bytes calldata proof, bytes20 root, bytes20 leaf) public pure returns (bool) {